Shell-lining for paper-pulp-grinding mills.



A. F. & 0. B. BAHR.

SHELL LlNING FOR PAPER PULP GRINDING MILLS.

Patented Sept. 7, 1915.

on on.

AMEL F. BAHR AND OTTO B. BAHR, MAR-ION, INDIANA.

SHELL-LINING FOR PAPER-PULP-GRINDING MIL LS.

Specification of Letters Patent.

Patented Sept. "Z, 1915.

Application filed August 5, 1913, Serial No. 783.219. Renewed February5, 1915. Serial'No. 6,397.

To all whom it may concern: I

Be it known'that we, AMEL F. BAIIR and O'rro B. BAI-IR, citizens of theUnited States, residing at Marion, in the county of Grant and State ofIndiana, have invented certain new and useful Improvements inShell-Linings for Paper-Pulp-Grinding Mills, of which the following is aspecification.

This invention relates particularly to improvements in shell linings forpaper pulp grinding mills adapted for use with such apparatus asdisclosed in our previous Patent' No. 946,752, granted January 18th,1910.

The particular object of our present device is to provide these shelllinings with a novel arrangement of blades or knives whereby to retardthe flow of the pulp through the machine while, at the same time, permitof the passage of nails or other foreign substances therethrough whichmight otherwise lodge against lugs usually employed for this retardingfunction.

With the above and other objects in view, this invention consists in theconstruction, combination and arrangement of parts all as hereinaftermore fully described, claimed and illustrated in the accompanyingdrawing, wherein Figure 1 is a side elevation of a shell lining, aportion being broken away to show our arrangement of blades. Fig. 2 isan end elevation of the lining. Fig. 3' is a perspective view of anenlarged section of the lining.

Throughout the following detail. descrip tion, and on the severalfigures of the drawings, similar parts are referred to by like referencecharacters.

Referring to the drawings a lining shell comprehended by our inventionis preferably of metallic material and consists inshape of a hollowtruncated cone. The cone is formed with any desirable number offrusto-conical sections, such as designated by the numerals 1 and 2 andeach of these sections may also consist of longitudinal sections, thelining being provided with openings 3 by means of which it may besecured to the outer casing of the pulp mill, not shown in thepresentvcase. The lining is formed witha plurality of internal knives orblades 4 adapted to perform the usual grinding function. Each of theseblades consists of spaced alined longitudinal sections 5 between whichare located the retarding sections. The latter retarding sectionsconsist of angular or laterally extending webs 6 and 6, these webs beingjoined together at one end and connected at their other ends to thelongitudinal sections 5, hereinbefore mentioned. Furthermore, the bladesor knives 4 are arranged in parallel relation to each other throughouttheir length and including the angular webs 6 and 6.

From th foregoing, it will be understood that the p lp in passingthrough the machine will be forced to flow in a zigzag or serpentinepath between the blades, the flow being properly retarded by the angularwebs 6 and 6' so as to insure proper disintegration before the pulpissues from the mill. Heretofore, it has been customary to employ lugswhich are interposed between the blades for the purpose of performingtheretarding function, but such devices prevent foreign substances suchas nails and the like from passing through. To those skilled in the art,it will be clear that the lodgment of these foreign substances createssometimes considerable damage to the linings and, therefore, theformation of the plates as described in the foregoing greatlyfacilitates the proper disintegration of the pulp as wellas eliminatesthis danger of injury to the lining.

It will be understood that changes may be made in the exact division ofthe lining into sections to permit of its positioning in the casing ofthe pulp mill without departing in any way from the spirit of ourinvention and within the scope of the claims hereto appended.

Having thus described the invention, what we claim as new is:

1. A shell lining for-paper pulp grinding mills comprising a hollow bodyhaving internal blades, each formed with alined axial sections connectedby off-standing retarding sections. 1

2. A shell lining for paper pulp grinding mills comprising a hollowtruncated conical section having a plurality of internal blades, eachblade consisting of spaced longitudinal sections and intermediateretarding sections, the latter comprising laterally extending 4 websconnected together at one end and at 3. A shell lining for paper pulpgrinding In testimony whereof We affix our signamills comprising ahollow truncated conical tures in presence of two Witnesses.

section having a plurality of internal blades each blade consisting ofspaced alined longi tudinal sections and intermediate V-shaped retardingsections, the longitudinal and re- Witnesses:

tarding sections of the blades being ar- CORA SAUMENIG,

ranged in parallel relation to each other. VICTO OLLIVER.

